[Nadya]

>How do you justify 150k salary in US vs 25k salary in India ? Different costs of living ? Yes and no. In many poor countries some stuff is just more expensive than in the richer ones.

What people are willing to work for.

If nobody in India was willing to do the job for $25k annual salary - they would need to be offered more to do the job. Flat out, that simple. It turns out that there are many people willing to do the job for the lower pay - because it beats other options available to them.

On the other side of the coin - fewer people would take the job in the U.S if it wasn't $150k/yr salary. They'd walk to another offer that they feel is worth their time because the offer doesn't beat other options available to them.